Collagen
PromisingStructural protein for skin elasticity, joint comfort, and hair health.
Not medical advice
Nutripedia summarises published peer-reviewed research. This content is for informational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare professional before taking any supplement.
Collagen is the most abundant protein in the human body, forming the structural scaffold of skin, tendons, ligaments, cartilage, and bone. Hydrolysed collagen peptides are produced by enzymatic breakdown of animal-sourced collagen (bovine, porcine, or marine) into short-chain peptides that are readily absorbed. Supplementation has growing RCT evidence for skin elasticity, joint pain reduction, and bone density support, though most trial data comes from industry-funded studies.
Growing RCT evidence for skin hydration and elasticity (meta-analysis of 11 trials). Joint pain reduction shown in athletes and older adults. Mechanistic debate about whether bioactive peptides or amino acid supply drives effects. Most trials are industry-sponsored; independent replication is limited. No EFSA-authorised health claims specifically for collagen supplements.
Skin Hydration & Elasticity
19 studies · 1,125 participants
Joint Pain & Comfort
11 studies · 1,090 participants
Muscle Mass & Strength (with Resistance Training)
6 studies · 432 participants
The Evidence
14 peer-reviewed papers, updated 5 days ago
7 meta-analyses · 6 RCTs · 1 cohort study
Efficacy of collagen peptide supplementation on bone and muscle health: a meta-analysis
Chongxiao Sun, Ao Yang, Fei Teng et al.
Frontiers in Nutrition
Meta-analysis of RCTs found that collagen peptide supplementation significantly increased BMD at the femoral neck and spine and improved bone turnover markers (SMD 0.40–0.58) and muscle performance (SMD 0.60). Effects were amplified when collagen was co-supplemented with calcium and vitamin D.
Efficacy of combined undenatured type II collagen and hydrolysed collagen supplementation in knee osteoarthritis: a randomised controlled trial
Yuenyongviwat V, Anusitviwat C, Tuntarattanapong P et al.
Scientific Reports
Double-blind RCT of 68 knee OA patients found that combined UC-II and hydrolysed collagen supplementation over 12 weeks did not demonstrate superior efficacy versus placebo for pain, function, or rescue medication use. Both groups improved, suggesting placebo response or natural disease progression may account for gains.
Effects of Collagen Supplements on Skin Aging: A Systematic Review and Meta-Analysis of Randomized Controlled Trials
Seung-Kwon Myung, Yunseo Park
American Journal of Medicine
Meta-analysis of 23 RCTs (1,474 participants) found that when limited to high-quality trials and those without pharmaceutical industry funding, collagen supplements showed no significant benefit for skin hydration, elasticity, or wrinkles. Authors conclude there is currently insufficient clinical evidence to support their use for skin aging.
Effect of collagen supplementation on knee osteoarthritis: an updated systematic review and meta-analysis of randomised controlled trials
Mario Simental-Mendía, Daniela Ortega-Mata, Carlos A Acosta-Olivo et al.
Clinical and Experimental Rheumatology
Updated meta-analysis of 11 RCTs (870 participants) confirmed that oral collagen administration significantly improves both pain scores and functional capacity in knee osteoarthritis versus placebo, supporting its use as an adjunct to standard care.
Efficacy and safety of collagen derivatives for osteoarthritis: A trial sequential meta-analysis
Chun-Wei Liang, Hsiao-Yi Cheng, Yu-Hao Lee et al.
Osteoarthritis and Cartilage
Trial sequential meta-analysis of 35 RCTs (3,165 patients) found that collagen derivatives produced small-to-moderate reductions in pain (SMD −0.35) and improved function (SMD −0.31) versus control with no elevated safety risk. Statistical power thresholds were met, providing strong evidence for efficacy in osteoarthritis.
Exploring the Impact of Hydrolyzed Collagen Oral Supplementation on Skin Rejuvenation: A Systematic Review and Meta-Analysis
Dian Andriani Ratna Dewi
Cureus
Meta-analysis of 14 RCTs (967 participants) found that hydrolysed collagen supplementation over 12 weeks consistently produced significant improvements in skin moisture, elasticity, wrinkle depth, and transepidermal water loss compared with placebo. No adverse effects were reported.
Analgesic efficacy of collagen peptide in knee osteoarthritis: a meta-analysis of randomized controlled trials
Lin CR, Tsai SHL, Huang KY et al.
Journal of Orthopaedic Surgery and Research
Analysis of 4 RCTs (507 patients with knee OA) found that collagen peptide treatment produced significant pain relief versus placebo. All included trials carried high risk of bias; the authors emphasise the need for well-designed confirmatory RCTs before firm clinical conclusions can be drawn.
Effects of Oral Collagen for Skin Anti-Aging: A Systematic Review and Meta-Analysis
Szu-Yu Pu, Ya-Li Huang, Chi-Ming Pu et al.
Nutrients
Analysis of 26 RCTs (1,721 participants) found that hydrolysed collagen supplementation significantly improved skin hydration and elasticity versus placebo, with effects reaching significance after 8 or more weeks. Authors note large-scale confirmatory trials are still needed.
Effects of specific collagen peptide supplementation combined with resistance training on Achilles tendon properties
Jerger S, Centner C, Lauber B et al.
Scandinavian Journal of Medicine and Science in Sports
14-week RCT in physically active young men found that specific collagen peptides combined with resistance training produced significantly greater increases in Achilles tendon cross-sectional area (11.0% vs 4.7%) and muscle thickness (7.3% vs 2.7%) compared with training plus placebo.
Specific Bioactive Collagen Peptides in Osteopenia and Osteoporosis: Long-Term Observation in Postmenopausal Women
Denise Zdzieblik, Steffen Oesser, Daniel König
Journal of Bone Metabolism
4-year open-label follow-up (31 postmenopausal women with low BMD) found that daily intake of bioactive collagen peptides produced a progressive, clinically relevant increase in spinal and femoral neck BMD, indicating sustained anabolic bone metabolism with extended supplementation.
Oral Supplementation of Specific Collagen Peptides Combined with Calf-Strengthening Exercises Enhances Function and Reduces Pain in Achilles Tendinopathy Patients
Praet SFE, Purdam CR, Welvaert M et al.
Nutrients
Double-blind crossover pilot RCT (20 participants, 6 months) found that specific collagen peptides combined with eccentric calf-strengthening exercises increased VISA-A scores by 12.6 points versus 5.3 points for placebo, suggesting collagen may accelerate clinical recovery in chronic Achilles tendinopathy pending larger trials.
Specific Collagen Peptides Improve Bone Mineral Density and Bone Markers in Postmenopausal Women—A Randomized Controlled Study
Daniel König, Steffen Oesser, Stephan Scharla et al.
Nutrients
12-month double-blind RCT (102 postmenopausal women) found that 5 g specific collagen peptides daily significantly increased bone mineral density at the spine (SMD 0.58) and femoral neck (SMD 0.46) and shifted bone turnover markers toward net bone formation compared with placebo.
Vitamin C-enriched gelatin supplementation before intermittent activity augments collagen synthesis
Gregory Shaw, Ann Lee-Barthel, Megan LR Ross et al.
American Journal of Clinical Nutrition
Randomised crossover trial (8 healthy men) found that 15 g vitamin C-enriched gelatin consumed 1 hour before intermittent exercise doubled circulating collagen synthesis markers and improved engineered ligament mechanics in vitro, suggesting a practical strategy for musculoskeletal tissue repair and injury prevention.
Collagen peptide supplementation in combination with resistance training improves body composition and increases muscle strength in elderly sarcopenic men: a randomised controlled trial
Zdzieblik D, Oesser S, Baumstark MW et al.
British Journal of Nutrition
12-week double-blind RCT (53 sarcopenic men, mean age 72) found that 15 g/day collagen peptides combined with resistance training produced greater gains in fat-free mass (+4.2 vs +2.9 kg), quadriceps strength (+16.5 vs +7.3 Nm), and fat loss (−5.4 vs −3.5 kg) compared with training plus placebo.
Evidence Database
Click any row to explore the studies behind each health outcome. Grades reflect the volume and quality of published research, not a recommendation.
| Grade | Health Outcome | |
|---|---|---|
| B | Skin Hydration & Elasticity19 studies | |
| B | Joint Pain & Comfort11 studies | |
| C | Muscle Mass & Strength (with Resistance Training)6 studies | |
| C | Bone Mineral Density4 studies |
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General Information
Dosage (Evidence-Reported)
These figures reflect what clinical studies used — not personalised recommendations.
Safety Notes
- Most products are bovine, porcine, or marine — check for source allergies
- Not suitable for vegans — no verified plant-based collagen alternative exists
- Most trial evidence is industry-funded — independent replication is limited
- EFSA has not authorised specific health claims for collagen supplement outcomes
- Marine collagen: avoid if fish/shellfish allergy present
Key Benefits
- Improves skin hydration and elasticity — meta-analysis of 11 RCTs
- Reduces activity-related joint pain in athletes and older adults
- May support bone mineral density in post-menopausal women
- Provides glycine and proline — amino acids important for connective tissue
- Preliminary evidence for improved lean mass with resistance training in older adults
Quick Facts
Legal food supplement (UK). Classified as a food ingredient, not a pharmaceutical. No EFSA-authorised health claims specific to collagen supplements. No NHS dietary guidance for supplementation.
Frequently Asked Questions
Nutripedia is an educational resource. Content is sourced from peer-reviewed studies and does not constitute medical advice. Consult a healthcare professional before starting any supplement.